They sell it to Google(Alphabet Inc.), i.e. AdMob, AdSense and Double Click, and Baidu as well. To give you personal targeted ads that you might be interested in, based on what you're doing and personal data on your phone.
All "battery savers" are snake oil. Your device has been optimized by its manufacturer to perform to the best of its ability - including the battery. Sometimes less is more. The less third-party apps you install, and just leave the inner work to Android, the better. Same with "task killers."
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